Decorative lamp base



FIG. 1 is a perspective view of a decorative lamp base showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a perspective view of a second embodiment of my new design;

FIG. 5 is a side elevational view thereof; and

FIG. 6 is a top view thereof.

The light bulb socket and shaft are shown in broken lines for illustrative purposes only. 

The ornamental design for a decorative lamp base, as shown and described. 